diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90425e73..6586b38f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -51,6 +51,20 @@ Enhancements
 * `StaticVec` is changed to keep three items inline instead of four.
 
 
+Version 1.0.6
+=============
+
+
+Version 1.0.5
+=============
+
+Bug fixes
+---------
+
+* `FloatWrapper` is no longer erroneously exported under `no_float+internals`.
+* The `sign` function now works properly for float values that are `NaN`.
+
+
 Version 1.0.4
 =============
 
diff --git a/codegen/ui_tests/rhai_fn_non_clonable_return.stderr b/codegen/ui_tests/rhai_fn_non_clonable_return.stderr
index f2733fce..21e23630 100644
--- a/codegen/ui_tests/rhai_fn_non_clonable_return.stderr
+++ b/codegen/ui_tests/rhai_fn_non_clonable_return.stderr
@@ -2,7 +2,10 @@ error[E0277]: the trait bound `NonClonable: Clone` is not satisfied
     --> $DIR/rhai_fn_non_clonable_return.rs:11:8
      |
 11   | pub fn test_fn(input: f32) -> NonClonable {
-     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `NonClonable`
+     |        ^^^^^^^^^^^^^^^^^^^^^^^-----------
+     |        |                      |
+     |        |                      required by a bound introduced by this call
+     |        the trait `Clone` is not implemented for `NonClonable`
      |
 note: required by a bound in `rhai::Dynamic::from`
     --> $DIR/dynamic.rs:1121:30
diff --git a/codegen/ui_tests/rhai_mod_non_clonable_return.stderr b/codegen/ui_tests/rhai_mod_non_clonable_return.stderr
index 122d2b26..772a5112 100644
--- a/codegen/ui_tests/rhai_mod_non_clonable_return.stderr
+++ b/codegen/ui_tests/rhai_mod_non_clonable_return.stderr
@@ -2,7 +2,10 @@ error[E0277]: the trait bound `NonClonable: Clone` is not satisfied
     --> $DIR/rhai_mod_non_clonable_return.rs:12:12
      |
 12   |     pub fn test_fn(input: f32) -> NonClonable {
-     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `NonClonable`
+     |            ^^^^^^^^^^^^^^^^^^^^^^^-----------
+     |            |                      |
+     |            |                      required by a bound introduced by this call
+     |            the trait `Clone` is not implemented for `NonClonable`
      |
 note: required by a bound in `rhai::Dynamic::from`
     --> $DIR/dynamic.rs:1121:30
diff --git a/src/lib.rs b/src/lib.rs
index f3a0af66..9d4c25c4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -229,10 +229,15 @@ pub use token::{InputStream, Token, TokenizeState, TokenizerControl, TokenizerCo
 #[cfg(feature = "internals")]
 #[deprecated = "this type is volatile and may change"]
 pub use ast::{
-    ASTNode, BinaryExpr, CustomExpr, Expr, FloatWrapper, FnCallExpr, FnCallHashes, Ident,
-    OpAssignment, OptionFlags, ScriptFnDef, Stmt, StmtBlock, AST_OPTION_FLAGS::*,
+    ASTNode, BinaryExpr, CustomExpr, Expr, FnCallExpr, FnCallHashes, Ident, OpAssignment,
+    OptionFlags, ReturnType, ScriptFnDef, Stmt, StmtBlock, AST_OPTION_FLAGS::*,
 };
 
+#[cfg(feature = "internals")]
+#[cfg(not(feature = "no_float"))]
+#[deprecated = "this type is volatile and may change"]
+pub use ast::FloatWrapper;
+
 #[cfg(feature = "internals")]
 #[deprecated = "this type is volatile and may change"]
 pub use engine::{EvalState, FnResolutionCache, FnResolutionCacheEntry, Imports};
diff --git a/src/packages/arithmetic.rs b/src/packages/arithmetic.rs
index 074b19cf..66c05978 100644
--- a/src/packages/arithmetic.rs
+++ b/src/packages/arithmetic.rs
@@ -163,13 +163,7 @@ macro_rules! gen_signed_functions {
                     }
                 }
                 pub fn sign(x: $arg_type) -> INT {
-                    if x == 0 {
-                        0
-                    } else if x < 0 {
-                        -1
-                    } else {
-                        1
-                    }
+                    x.signum() as INT
                 }
             }
         })* }
@@ -249,6 +243,8 @@ gen_signed_functions!(signed_num_128 => i128);
 #[cfg(not(feature = "no_float"))]
 #[export_module]
 mod f32_functions {
+    use crate::EvalAltResult;
+
     #[cfg(not(feature = "f32_float"))]
     pub mod basic_arithmetic {
         #[rhai_fn(name = "+")]
@@ -329,13 +325,15 @@ mod f32_functions {
     pub fn abs(x: f32) -> f32 {
         x.abs()
     }
-    pub fn sign(x: f32) -> INT {
+    #[rhai_fn(return_raw)]
+    pub fn sign(x: f32) -> Result<INT, Box<EvalAltResult>> {
         if x == 0.0 {
-            0
-        } else if x < 0.0 {
-            -1
+            Ok(0)
         } else {
-            1
+            match x.signum() {
+                x if x.is_nan() => Err(make_err("Sign of NaN is undefined")),
+                x => Ok(x as INT),
+            }
         }
     }
     pub fn is_zero(x: f32) -> bool {
@@ -437,13 +435,15 @@ mod f64_functions {
     pub fn abs(x: f64) -> f64 {
         x.abs()
     }
-    pub fn sign(x: f64) -> INT {
+    #[rhai_fn(return_raw)]
+    pub fn sign(x: f64) -> Result<INT, Box<EvalAltResult>> {
         if x == 0.0 {
-            0
-        } else if x < 0.0 {
-            -1
+            Ok(0)
         } else {
-            1
+            match x.signum() {
+                x if x.is_nan() => Err(make_err("Sign of NaN is undefined")),
+                x => Ok(x as INT),
+            }
         }
     }
     pub fn is_zero(x: f64) -> bool {
diff --git a/src/scope.rs b/src/scope.rs
index 323d78fd..028287a5 100644
--- a/src/scope.rs
+++ b/src/scope.rs
@@ -464,6 +464,9 @@ impl<'a> Scope<'a> {
     /// *ptr = 123_i64.into();
     ///
     /// assert_eq!(my_scope.get_value::<i64>("x").expect("x should exist"), 123);
+    ///
+    /// my_scope.push_constant("Z", 1_i64);
+    /// assert!(my_scope.get_mut("Z").is_none());
     /// ```
     #[inline]
     #[must_use]